Extraction of copper and other metals from roasted pyrites.



V l. r ow t a to; l iii ll lrh is AUGUSTE "llXllCR AND GASIMIR TORTEL,OF PARIS, FRANCE, ASSIGNOR S TO LES PRODUITS OHIIMQUE DE (ZROISSY (.T.BASLER 8c 00.), OF PARIS, .lFHANOE.

ETS'LTRAE-G'IEION O1? SUPPER AND OTHER TJEZETALS FROIX'IE RGASTZEIUIFSZHITEEK Specification of Letters Patent.

Patented Dec. 31, 1E0? Application filed August- 31, 1906. Serial No.332355.

.i'h (all whom it may concern.

Be it known that We, i LUGUSTE Tixiim and Ciisiil'iii TORTEL,choi'nists, both of 82 Rue St. liszere, Paris, France, h V8 iiwentedoer-- tein. new and. useful improvements in the Extraction. of Copperfrom Pyrites, of which. the following is a specification.

The present invention relates to a new and improved orocess for theextraction of copper l TOHl iron pyritcs.

The new process possesses the great mlvzmtsgc over the methods hithertoemployed, that it el'l'ects the extraction of the roppor by :i selectiveaction whereby the copper is dissolved, while the iron is substantiallyunattached. it thus permits ol :1, more complete extraction of thecopper at a lower cost. It also extracts from theiron pyrites nearly theWhole of the other foreign metals, such as lead, Zinc, silver and thelike which in many give rise to inconveniences in the metallurgy ofirorr The process con ts iii roosting the iron pyrites and thereaftertreating them with nascent chlorin in a Worm acid liquor, pref ersbly ata temperature of about 70 to 80 C. 'lhe copper and other foreign metalsare thereby dissolved, leaving the iron substatio v tiolly unattachedand the liquors and Washings worked up in the usual way.

Practically the following has been Found to he the ocst mode of carryingout the lIlVOK1- tion, but it is only given by way of example, and mayhe voriccl considerably in details sud i: the generation ol' thechlorin.

The iron pyrites are roasted and mixed in a clry state with to per cent.of coloniesl chlorid of lime, or they are moistened otter roosting withsolutions of hypochlorites of clkolies or alkaline earths containing atlike quantity of" available chlorin. The

mixed ore is then introduced into vets, Where it is sprayed with dilutesulfuric or hydrochloric acid and warmed to keep the term ,to proceedfor 12 to hours, the liquors then drawn oil, and. the residue washedwith lukewarm dilute acid. and then with Wete T. 'i he iron residues arethen practically tree from foreign metals. The raising of tempera tureis essential for the attainment the selective action of the chh csmerit.

l l hot We claim will u Letters lotoiit is:-

1. Method or proc or the err :cction oi copper from iron pyriies,comprising rossting of the pyrites :tml trcetiiicnt ol tho roastedpyrites with nascent chlorio in a warm acid liquor, w r lay the copperis separated and the iron is substantially unattached.

2. il'lcthod. or prose for the extraction of copper from iron m cs,comprising roasting of the pyrites and tiestmeiit of the roasted pyriteswith nascent chlorin in an acid liquor zit temperature of shout 70 to 80C, whereby the copper is separated and the iron is substantially in]attacked.

3. Method or process lor'the extraction oi copper from iroii pyrites,comprising roasttl pyrites, and treatment of the roasted 9, temperatureoi about 70 to 80 U. with mineral acid, hydrochloric aiciri, theiireseiioe of an alkali con1- pound capable of liberating chlorin windthe action of the ccici, whereby the cop seperaterl and the ironsuhstsntislly uriet-- tscherl.

l i. witness o have hereunto nod our names in the presence of two schscribing witnesses.

l puris /HE 'l.@RTEL.

